My girlfriend has one of these and we've seen information that says you are supposed to be watering it frequently (every day to "keep wet"). the problem is that she was watering it once a week (never really drying out) and the roots don't seem to be doing so well. Some are rotting and there is just not much root growth and is not really rooted in the bark. What could be the issue? More water? More rocks in the mix? More fertilizer? Thanks.